VTU 5th Sem TOC: Convert CFG to CNF Step-by-Step

Welcome to Express VTU 4 All 🎓
In this video, we solve one of the most important Theory of Computation questions from Module-04: Properties of Context-Free Languages (CFL).
We convert a given Context Free Grammar (CFG) into Chomsky Normal Form (CNF) using proper step-by-step procedure, exactly as required in VTU external examinations.
📌 Exact Question Covered in This Video
Convert the following CFG into Chomsky Normal Form (CNF):
E → E + T | T
T → T * F | F
F → ( E ) | I
I → Ia | Ib | a | b
🧠 What You Will Learn in This Video
✔ What is Chomsky Normal Form (CNF)
✔ Rules and conditions of CNF
✔ Step-by-step method to convert CFG to CNF
✔ Removal of ε-productions (if any)
✔ Removal of unit productions
✔ Removal of useless symbols
✔ Conversion of long productions into binary productions
✔ Replacement of terminals with new variables
✔ Final CNF grammar ready for VTU exams
📘 Chomsky Normal Form (Exam Definition)
A Context-Free Grammar is said to be in Chomsky Normal Form (CNF) if all productions are of the form:
• A → BC
• A → a
where
A, B, C ∈ Non-terminals
a ∈ Terminals
🎯 Why This Question Is VERY IMPORTANT for VTU
✔ Frequently asked in externals & internals
✔ Carries 8–10 marks
✔ Core topic of Module-04 (CFL)
✔ Helps in understanding CYK Parsing Algorithm
✔ Repeated question in previous VTU question papers
👨‍🎓 Who Should Watch This Video
✔ VTU CSE / ISE / AIML / DS students
✔ Students preparing for TOC Module-04
✔ Learners struggling with CFG transformations
✔ Anyone revising CNF for exams
📚 Subject & Syllabus Details
📌 Subject: Theory of Computation
📌 Subject Code: BCS503
📌 Module: 04 – Properties of Context Free Languages
📌 University: VTU (CBCS Scheme)
📌 Free Handwritten VTU Notes
Complete CFG, CNF, GNF and CFL notes are available on my Telegram channel 👇
🔗 Join here: https://t.me/vtu4all


CFG to CNF conversion
Chomsky Normal Form VTU
CNF in Theory of Computation
VTU TOC Module 4
BCS503 CFL
CFG transformation
Chomsky Normal Form solved example
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👉 Watch till the end to clearly understand each CNF conversion step and download free VTU handwritten notes from Telegram.